|Year|Competition|Venue|Position|Event|Notes|
|---|---|---|---|---|---|
|1975|Asian Championships|Seoul, South Korea|1st|5,000m|14:00.8|
|1979|Asian Championships|Tokyo, Japan|2nd|10,000m|29:00.2|
|1981|Asian Championships|Tokyo, Japan|1st|10,000m|28:53.29|
|1981|Fukuoka Marathon|Fukuoka, Japan|2nd|Marathon|2:09:37|
|1982|Fukuoka Marathon|Fukuoka, Japan|4th|Marathon|2:11:45|
|1983|World Championships|Helsinki, Finland|28th|10,000m|29:49.04|

Question: what year was itoh's only victory at the 10,000m distance.
Answer: 1981